GSM(Global System for Mobile Communications) is the most popular standard for mobile telephony systems in the world
It is a 2G Mobile Telecommunications Standard that uses CDMA, a multiple access scheme for digital radio, to send voice, data and signaling data (such as a dialed telephone number) between mobile telephones and cell sites.
Wideband CDMA is a third-generation (3G) mobile wireless technology that promises much higher data speeds to mobile and portable wireless devices than commonly offered in today's market.
CDMA2000 is a third-generation (3G) wireless technology that is evolved from existing CDMA 2G technologies. Its main features are faster data rates, always-on data service, and improved voice network capacity (more people can use each tower at the same time).
TD-SCDMA (time division synchronous code division multiple access) is a mobile telephone standard for wireless network operators who want to move from a second generation (2G) wireless network to a third-generation (3G) one.
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